I'm looking for a script that executes a moving average filter algorithm in C language, compatible with the H7 Portenta. Since I am new to C, I would appreciate if someone can let me know where I can find them or if there are any existing sources for scripts written in C.
Works good, sebnil/Moving-Avarage-Filter--Arduino-Library-: A moving average, also called rolling average, rolling mean or running average, is a type of finite impulse response filter (FIR) used to analyze a set of datum points by creating a series of averages of different subsets of the full data set. (github.com) and can be modified to suit your needs.
That library misses an important trick - for instance if you gave it a filter size of 100 it would sum 100 elements every time you pass it a new data point - not exactly efficient.
The trick with a moving average is to maintain the total without summing every value every time, ie pseudo-code more like:
total -= array[i] ; // oldest value is being lost off the end, so subtract from total
total += new_value ;
array[i] = new_value ; // new value replaces oldest
i = (i+1) % size ; // step forward in buffer, wrapping as needed
return (float) total / size ; // no loop needed to return latest average as total is accurate.Excellent post, that is a common error made in many moving average implementations. the speed up factor is about the number of the averaged samples, significant.
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